Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
/*
* ejabberd extauth script for the integration with friendica
*
* Originally written for joomla by Dalibor Karlovic <dado@krizevci.info>
* modified for Friendica by Michael Vogel <icarus@dabo.de>
* published under GPL
*
* Latest version of the original script for joomla is available at:
* http://87.230.15.86/~dado/ejabberd/joomla-login
*
* Installation:
*
* - Change it's owner to whichever user is running the server, ie. ejabberd
* $ chown ejabberd:ejabberd /path/to/friendica/scripts/auth_ejabberd.php
*
* - Change the access mode so it is readable only to the user ejabberd and has exec
* $ chmod 700 /path/to/friendica/scripts/auth_ejabberd.php
*
* - Edit your ejabberd.cfg file, comment out your auth_method and add:
* {auth_method, external}.
* {extauth_program, "/path/to/friendica/script/auth_ejabberd.php"}.
*
* - Restart your ejabberd service, you should be able to login with your friendica auth info
*
* Other hints:
* - if your users have a space or a @ in their nickname, they'll run into trouble
* registering with any client so they should be instructed to replace these chars
* " " (space) is replaced with "%20"
* "@" is replaced with "(a)"
*
*/
namespace Friendica\Util;
use Friendica\Core\Config;
use Friendica\Core\PConfig;
use Friendica\Database\DBM;
use Friendica\Model\User;
use dba;
require_once 'include/dba.php';
require_once 'include/dba.php';
class ExAuth
{
private $bDebug;
private $host;
/**
* @brief Create the class
*
* @param boolean $bDebug Debug mode
*/
public function __construct()
{
$this->bDebug = (int) Config::get('jabber', 'debug');
openlog('auth_ejabberd', LOG_PID, LOG_USER);
$this->writeLog(LOG_NOTICE, 'start');
}
/**
* @brief Standard input reading function, executes the auth with the provided
* parameters
*
* @return null
*/
public function readStdin()
{
while (!feof(STDIN)) {
// Quit if the database connection went down
if (!dba::connected()) {
$this->writeLog(LOG_ERR, 'the database connection went down');
return;
}
$iHeader = fgets(STDIN, 3);
$aLength = unpack('n', $iHeader);
$iLength = $aLength['1'];
// No data? Then quit
if ($iLength == 0) {
$this->writeLog(LOG_ERR, 'we got no data, quitting');
return;
}
// Fetching the data
$sData = fgets(STDIN, $iLength + 1);
$this->writeLog(LOG_DEBUG, 'received data: ' . $sData);
$aCommand = explode(':', $sData);
if (is_array($aCommand)) {
switch ($aCommand[0]) {
case 'isuser':
// Check the existance of a given username
$this->isUser($aCommand);
break;
case 'auth':
// Check if the givven password is correct
$this->auth($aCommand);
break;
case 'setpass':
// We don't accept the setting of passwords here
$this->writeLog(LOG_NOTICE, 'setpass command disabled');
fwrite(STDOUT, pack('nn', 2, 0));
break;
default:
// We don't know the given command
$this->writeLog(LOG_NOTICE, 'unknown command ' . $aCommand[0]);
fwrite(STDOUT, pack('nn', 2, 0));
break;
}
} else {
$this->writeLog(LOG_NOTICE, 'invalid command string ' . $sData);
fwrite(STDOUT, pack('nn', 2, 0));
}
}
}
/**
* @brief Check if the given username exists
*
* @param array $aCommand The command array
*/
private function isUser(array $aCommand)
{
$a = get_app();
// Check if there is a username
if (!isset($aCommand[1])) {
$this->writeLog(LOG_NOTICE, 'invalid isuser command, no username given');
fwrite(STDOUT, pack('nn', 2, 0));
return;
}
// We only allow one process per hostname. So we set a lock file
// Problem: We get the firstname after the first auth - not before
$this->setHost($aCommand[2]);
// Now we check if the given user is valid
$sUser = str_replace(['%20', '(a)'], [' ', '@'], $aCommand[1]);
// Does the hostname match? So we try directly
if ($a->get_hostname() == $aCommand[2]) {
$this->writeLog(LOG_INFO, 'internal user check for ' . $sUser . '@' . $aCommand[2]);
$found = dba::exists('user', ['nickname' => $sUser]);
} else {
$found = false;
}
// If the hostnames doesn't match or there is some failure, we try to check remotely
if (!$found) {
$found = $this->checkUser($aCommand[2], $aCommand[1], true);
}
if ($found) {
// The user is okay
$this->writeLog(LOG_NOTICE, 'valid user: ' . $sUser);
fwrite(STDOUT, pack('nn', 2, 1));
} else {
// The user isn't okay
$this->writeLog(LOG_WARNING, 'invalid user: ' . $sUser);
fwrite(STDOUT, pack('nn', 2, 0));
}
}
/**
* @brief Check remote user existance via HTTP(S)
*
* @param string $host The hostname
* @param string $user Username
* @param boolean $ssl Should the check be done via SSL?
*
* @return boolean Was the user found?
*/
private function checkUser($host, $user, $ssl)
{
$this->writeLog(LOG_INFO, 'external user check for ' . $user . '@' . $host);
$url = ($ssl ? 'https' : 'http') . '://' . $host . '/noscrape/' . $user;
$data = z_fetch_url($url);
if (!is_array($data)) {
return false;
}
if ($data['return_code'] != '200') {
return false;
}
$json = @json_decode($data['body']);
if (!is_object($json)) {
return false;
}
return $json->nick == $user;
}
/**
* @brief Authenticate the given user and password
*
* @param array $aCommand The command array
*/
private function auth(array $aCommand)
{
$a = get_app();
// check user authentication
if (sizeof($aCommand) != 4) {
$this->writeLog(LOG_NOTICE, 'invalid auth command, data missing');
fwrite(STDOUT, pack('nn', 2, 0));
return;
}
// We only allow one process per hostname. So we set a lock file
// Problem: We get the firstname after the first auth - not before
$this->setHost($aCommand[2]);
// We now check if the password match
$sUser = str_replace(['%20', '(a)'], [' ', '@'], $aCommand[1]);
// Does the hostname match? So we try directly
if ($a->get_hostname() == $aCommand[2]) {
$this->writeLog(LOG_INFO, 'internal auth for ' . $sUser . '@' . $aCommand[2]);
$aUser = dba::selectFirst('user', ['uid', 'password', 'legacy_password'], ['nickname' => $sUser]);
if (DBM::is_result($aUser)) {
$uid = $aUser['uid'];
$success = User::authenticate($aUser, $aCommand[3]);
$Error = $success === false;
} else {
$this->writeLog(LOG_WARNING, 'user not found: ' . $sUser);
$Error = true;
$uid = -1;
}
if ($Error) {
$this->writeLog(LOG_INFO, 'check against alternate password for ' . $sUser . '@' . $aCommand[2]);
$sPassword = PConfig::get($uid, 'xmpp', 'password', null, true);
$Error = ($aCommand[3] != $sPassword);
}
} else {
$Error = true;
}
// If the hostnames doesn't match or there is some failure, we try to check remotely
if ($Error) {
$Error = !$this->checkCredentials($aCommand[2], $aCommand[1], $aCommand[3], true);
}
if ($Error) {
$this->writeLog(LOG_WARNING, 'authentification failed for user ' . $sUser . '@' . $aCommand[2]);
fwrite(STDOUT, pack('nn', 2, 0));
} else {
$this->writeLog(LOG_NOTICE, 'authentificated user ' . $sUser . '@' . $aCommand[2]);
fwrite(STDOUT, pack('nn', 2, 1));
}
}
/**
* @brief Check remote credentials via HTTP(S)
*
* @param string $host The hostname
* @param string $user Username
* @param string $password Password
* @param boolean $ssl Should the check be done via SSL?
*
* @return boolean Are the credentials okay?
*/
private function checkCredentials($host, $user, $password, $ssl)
{
$this->writeLog(LOG_INFO, 'external credential check for ' . $user . '@' . $host);
$url = ($ssl ? 'https' : 'http') . '://' . $host . '/api/account/verify_credentials.json?skip_status=true';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_NOBODY, true);
curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_setopt($ch, CURLOPT_USERPWD, $user . ':' . $password);
curl_exec($ch);
$curl_info = @curl_getinfo($ch);
$http_code = $curl_info['http_code'];
curl_close($ch);
$this->writeLog(LOG_INFO, 'external auth for ' . $user . '@' . $host . ' returned ' . $http_code);
return $http_code == 200;
}
/**
* @brief Set the hostname for this process
*
* @param string $host The hostname
*/
private function setHost($host)
{
if (!empty($this->host)) {
return;
}
$this->writeLog(LOG_INFO, 'Hostname for process ' . getmypid() . ' is ' . $host);
$this->host = $host;
$lockpath = Config::get('jabber', 'lockpath');
if (is_null($lockpath)) {
$this->writeLog(LOG_INFO, 'No lockpath defined.');
return;
}
$file = $lockpath . DIRECTORY_SEPARATOR . $host;
if (PidFile::isRunningProcess($file)) {
if (PidFile::killProcess($file)) {
$this->writeLog(LOG_INFO, 'Old process was successfully killed');
} else {
$this->writeLog(LOG_ERR, "The old Process wasn't killed in time. We now quit our process.");
die();
}
}
// Now it is safe to create the pid file
PidFile::create($file);
if (!file_exists($file)) {
$this->writeLog(LOG_WARNING, 'Logfile ' . $file . " couldn't be created.");
}
}
/**
* @brief write data to the syslog
*
* @param integer $loglevel The syslog loglevel
* @param string $sMessage The syslog message
*/
private function writeLog($loglevel, $sMessage)
{
if (!$this->bDebug && ($loglevel >= LOG_DEBUG)) {
return;
}
syslog($loglevel, $sMessage);
}
/**
* @brief destroy the class, close the syslog connection.
*/
public function __destruct()
{
$this->writeLog(LOG_NOTICE, 'stop');
closelog();
}
}